“Three years later, word came to Judas Maccabeus and his men that Demetrius, the son of Seleucus, had sailed into the harbor of Tripolis with a strong army and a fleet. He had taken possession of the country, having made away with Antiochus and his guardian Lysias.”
This is similar to 1 Maccabees, chapter 7. About 161 BCE, King Demetrius I, who ruled the Seleucid Empire from 162-150 BCE, came with a strong army and navy fleet into the sea town of Tripolis. He was the son of King Seleucus IV and brother to King Antiochus IV. He had killed King Antiochus V, his nephew, and his guardian Lysias, who had run the government.
“In the one hundred and forty-ninth year, word came to Judas Maccabeus and his men that King Antiochus Eupator was coming with a great army against Judea. With him was Lysias, his guardian, who had charge of the government. Each of them had a Greek force of one hundred ten thousand infantry, five thousand three hundred cavalry, twenty-two elephants, and three hundred chariots armed with scythes.”
This is much the same as I Maccabees, chapter 6. In 162 BCE, King Antiochus V with his guardian Lysias was going to attack Judea. Clearly, the indication that the king is young is here since Lysias is called his guardian in charge of the government, not just a general. Here it says that each of them, the king and Lysias, had 110,000 infantry, 5,300 cavalry, and 22 elephants. While in 1 Maccabees, there were only 100,000 foot soldiers, but 20,000 cavalry, and 32 elephants. Obviously, these 2 different authors were using slightly different sources. Here there is the addition of the 300 chariots that had big blades like scythes that had been used since Persian times to cut down the foot soldiers. This was a bigger more dangerous force here.